Volvo C70 Owner's Manual page 201

FM stereo reception Radio antennas
NOTE: Always lower the antenna when using
an automatic car wash or entering a garage.
The antenna should be cleaned at least every
15,000 miles (24,000 km) or more frequently
if needed. Use WD40 for cleaning.
Spray the antenna with WD40 and wipe it
clean and dry with a rag. Spray it again. Lower
and raise the antenna. Wipe it clean and dry
again. Lower and raise the antenna 4-6 times.
Make sure it is dry and free from dirt or
lubricating oil.
Audio systems, general information
Diversity antenna (dual antenna
system)
195